I recently purchased a 03 f7 efi, got about five inches of snow today, so i could finally ride it. It ran just fine, until I stopped at the gas station and filled. I went in to pay, came back out, pulled it and it just fired a couple of times and would not start or even fire after that. After taking it home, we checked spark, that was good. We put a little gas in the cylinder, put the plug back in pulled it and it fired. Seems to be some sort of fuel issue? Just wondering if someone knows what it may be or has some kind of idea? Thanks in advance.